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authorThomas Petazzoni <thomas.petazzoni@free-electrons.com>2012-01-07 12:52:37 (GMT)
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-01-11 00:38:59 (GMT)
commit7a6f6c29d264cdd2fe0eb3d923217eed5f0ad134 (patch)
treefc2044a0b5f6300cafbae08285c84e8f9bc55fee /drivers/media/video/cx231xx
parent15cb6af8ac1ee1291f98bae51cd46c6719e90c0f (diff)
downloadlinux-fsl-qoriq-7a6f6c29d264cdd2fe0eb3d923217eed5f0ad134.tar.xz
[media] cx231xx: use URB_NO_TRANSFER_DMA_MAP on URBs allocated with usb_alloc_urb()
URBs allocated with usb_alloc_urb() are allocated from DMA-coherent areas, and therefore it is not necessary to call dma_map_single() on such buffers. Worst, on ARM, calling dma_map_single() on a DMA-coherent buffer will trigger a BUG_ON() in arch/arm/mm/dma-mapping.c. Therefore, we mark all URBs allocated with usb_alloc_urb() with the URB_NO_TRANSFER_DMA_MAP transfer_flags, so that the USB core does not do dma_map_single()/dma_unmap_single() on those buffers. This is similar to 882787ff8fdeb0be790547ee9b22b281095e95da for the gspca driver, and has already been discussed on the linux-media list in the past: http://www.mail-archive.com/linux-media@vger.kernel.org/msg37086.html. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/cx231xx')
-rw-r--r--drivers/media/video/cx231xx/cx231xx-audio.c4
-rw-r--r--drivers/media/video/cx231xx/cx231xx-core.c4
-rw-r--r--drivers/media/video/cx231xx/cx231xx-vbi.c2
3 files changed, 5 insertions, 5 deletions
diff --git a/drivers/media/video/cx231xx/cx231xx-audio.c b/drivers/media/video/cx231xx/cx231xx-audio.c
index e5742a0..a2c2b7d 100644
--- a/drivers/media/video/cx231xx/cx231xx-audio.c
+++ b/drivers/media/video/cx231xx/cx231xx-audio.c
@@ -307,7 +307,7 @@ static int cx231xx_init_audio_isoc(struct cx231xx *dev)
urb->context = dev;
urb->pipe = usb_rcvisocpipe(dev->udev,
dev->adev.end_point_addr);
- urb->transfer_flags = URB_ISO_ASAP;
+ urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
urb->transfer_buffer = dev->adev.transfer_buffer[i];
urb->interval = 1;
urb->complete = cx231xx_audio_isocirq;
@@ -368,7 +368,7 @@ static int cx231xx_init_audio_bulk(struct cx231xx *dev)
urb->context = dev;
urb->pipe = usb_rcvbulkpipe(dev->udev,
dev->adev.end_point_addr);
- urb->transfer_flags = 0;
+ urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
urb->transfer_buffer = dev->adev.transfer_buffer[i];
urb->complete = cx231xx_audio_bulkirq;
urb->transfer_buffer_length = sb_size;
diff --git a/drivers/media/video/cx231xx/cx231xx-core.c b/drivers/media/video/cx231xx/cx231xx-core.c
index 39e9878..08dd930 100644
--- a/drivers/media/video/cx231xx/cx231xx-core.c
+++ b/drivers/media/video/cx231xx/cx231xx-core.c
@@ -1074,7 +1074,7 @@ int cx231xx_init_isoc(struct cx231xx *dev, int max_packets,
sb_size, cx231xx_isoc_irq_callback, dma_q, 1);
urb->number_of_packets = max_packets;
- urb->transfer_flags = URB_ISO_ASAP;
+ urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
k = 0;
for (j = 0; j < max_packets; j++) {
@@ -1185,7 +1185,7 @@ int cx231xx_init_bulk(struct cx231xx *dev, int max_packets,
return -ENOMEM;
}
dev->video_mode.bulk_ctl.urb[i] = urb;
- urb->transfer_flags = 0;
+ urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
dev->video_mode.bulk_ctl.transfer_buffer[i] =
usb_alloc_coherent(dev->udev, sb_size, GFP_KERNEL,
diff --git a/drivers/media/video/cx231xx/cx231xx-vbi.c b/drivers/media/video/cx231xx/cx231xx-vbi.c
index 9c5967e..8cdee5f 100644
--- a/drivers/media/video/cx231xx/cx231xx-vbi.c
+++ b/drivers/media/video/cx231xx/cx231xx-vbi.c
@@ -452,7 +452,7 @@ int cx231xx_init_vbi_isoc(struct cx231xx *dev, int max_packets,
return -ENOMEM;
}
dev->vbi_mode.bulk_ctl.urb[i] = urb;
- urb->transfer_flags = 0;
+ urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
dev->vbi_mode.bulk_ctl.transfer_buffer[i] =
kzalloc(sb_size, GFP_KERNEL);